“And look, if Senator Corker is retiring and he doesn't want to be in the U.S. Senate and he doesn't want to support President Trump and doesn’t want to support such basic conservative principles, he should just resign,” Miller told CNN’s “New Day.”

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“Let the governor of Tennessee go and appoint a conservative like Marsha Blackburn, the congresswoman who’s running to replace Senator Corker and get somebody in there who’s actually going to support the president.”

The president in an early morning tweetstorm on Sunday said Corker “didn’t have the guts” to run for reelection and claimed the senator sought his endorsement, which Trump said he declined to provide. Corker shot back by describing the White House as “an adult day care center.”

“It's a shame the White House has become an adult day care center,” Corker wrote in a tweet. “Someone obviously missed their shift this morning.”

Corker’s chief of staff later said Trump encouraged Corker to run for reelection and offered his endorsement.

Miller on the Monday morning television show criticized Corker for his change in tone toward the president now that he is retiring.

“Look, Senator Corker definitely didn't mind kissing up to President Trump when he wanted to be vice president, when he wanted to be secretary of State,” Miller said.

“But now since he didn't get either of these positions and now he's retiring, he seems to just be kind of letting it all hang out there.”